Well bit



Aug. 23, 1932. J. c. WRIGHT 1,873,241

WELL BIT Filed Aug. 50.- 1929 Patented Aug. 23, 1932 "UNITED STATES PATENT OFFICE JESSE c. warm-moi? LOS ANGELES, CALIFORNIA, Assrenon TO GLOBE OIL rooms 00., r or LOS NIETOS, CALIFORNIA, A conronmrron or. CALIFORNIA -WELLIBIT I Application filed. Au usteo, 1929. Serial No. 329,429.

Thisinvention has to do with a bit and relates more particularly to a bit suitable for drilling'wells. It is a general ob ect of the present invention to provide a simple,

practical, inexpensive bit construction emfrom the shank to the head.

ploying a shank and a detachable drilling head.

A general object of the present invention is to provide a bit embodyinga shank for attachment to a drill stem, 2. head embodying a cutting member or teeth, and a simple, efiective and practical means for detachably con necting the head and shank.

It is an object'of the invention to provide a bit of the character mentioned in which the shank and head are connected so that driving strains are effectively transmitted I It is another object of the present invention to provide a bit of the charactermentioned in which the head is attached to the shank so that it is efiectively and dependably held on the shank, eliminating danger of loss of the head in the well.

Another object of the invention is toprovide a simple, practical and improvedlock ing means for securing a drilling head on a shank. The invention provides a construction that is simple of manufacture, easily handled, and dependable in operation.

It is a' further object of the invention to together. Fig. 2 is a'view showing the shank and head in the process of being arranged together. Fig. 3 is a view showing the shank and head of the bit arranged together in operating position with theheadlocked on the shank. Fig. t is a bottom view ofthe head showing the arrangement of teeth on-the head. Fig. 5 is a transversesectional view taken-substantially as indicated by line 55 on Fig. 2. Fig. 6 is a transverse sectional viewtaken as indicated by line 6-6 on Fig. 3. Fig, 7 is a transverse sectional View taken as indicated by line 77 on Fig. 3, and Fig. 8;is a vertical sectional view through the ner in which-the head fits the shank and the .shape'of certain of the teeth provided on 7 lower portion of the head showing the man string, for instance, to the'lower end of a drill collar, or the like The lower end portion 10 of the shank A' is round in cross section and has a flatlower end12. The upper end portion 11 of the shank is provided withmeans for making connection with adrilling string, for instance, in'ithe case illustrated, it is provided withv a tapered screw-threaded pin projection 13 toconnect with apart such as a drill collar, or the like. The upper end portion 11' of the shank. is enlarged at its:

lowerend forming an enlargement 11* over hanging the lower. end portion '10 of the shank to present a downwardly facing shoulder, 141.. u f i ,The head B provided for application to the shank A includes a sleeve portion 15 adapted to surround the lowerportion 10 of the shank A, a lower portion or extension 16 of the sleeve projecting below the shank A, and a plurality of teeth or cuttingv parts. Thesleeve 15 has a central opening 17 round in cross section and proportioned-toaccurately receive the lower portion 10 of the shank A. [The upper end 18 of the sleeve 15'isflat and adapted to fit the shoulder 14' of the shank. V In the preferred construction the outside diameter of the sleeve corresponds to that of the enlargement 11" of the upper end of the key 31 to prevent the key from moving upwardly in the passage. The key may be held from lateral displacement in the passage by enlarging the sleeve 15 at the passage so that it has a wall'50 covering or extending over the sleeve in'the manner clearly illustrated throughout the drawing.

In using the bit provided bythis inven tion the head is applied to the shank A and locked thereon by means of the keys 31. lVhen the keys are in place and the stop screws applied, as shown in the drawing, the head is securely and dependably fixed on the shank. When the tool has been run and it is desired to remove the head from the shank for purpose of repair or replacement, it is a simple matter to remove the stop screws 45 and the keys 31, allowing the head to be removed from the shank. The lugsBO are preferably integral with the shank so that the driving strains are communicated directly from the shank to the head, thus minimizing the danger of failure. It will be obvious that heads of various sizes and of various types may be applied to a shank, and it will also be apparent that the heads may be of simple, inexpensive construction, making the bit economical and of marked commercial value,

Having described only a typical preferred form and application of my invention, I do not wish to limit myself to the specific details set forth, but wish to reserve to myself any changes or variations that may appear to those skilled in the art or fall within the scope of the following claims.

Having described my invention, I claim:

1. In a well tool, two parts adapted to be subjected to torsion tending to cause relative rotation between them, one part having an opening adapted to receive a portion of the other part and having an external projection by means of which the torsional strain is put upon it, an enlargement on said section immediately forward of the projection relative to the direction of said strain, there being a passage in the wall of the opening radially in- Ward of the enlargement and a lateral socket located inward and forward of the said exter nal projection and communicating with the V passage, and a lug on said portion ofthe other part adapted to be passed through said passage into the socket to transmit the torsional strain from one part to the other.

2. In a well tool, two parts adapted to be subjected to torsion tending to cause relative rotation between them, one part having an opening adapted to receive aportion of the other part and having an external projection by means of which the torsional strain is put upon it, there being a passage in the wall of said opening and a lateral socket located inward and forward of said projection relative to the direction of said strain, a lug on said portion of the other part adapted to bepassed .hold the lug in the socket.

through said passage and into the socket to fit the same, and removable means holding the lug in the socket whereby the lug trans-- mit-s the torsional strain between the parts; 3. In a welltool, two. parts adapted to 'be subjected to torsion tending to cause relative rotation between them, one part having an opening adapted to receivela portion of the other part and having an external projection by means of which the torsional strain is put upon it, there being a passage in the wall of through saidpassage-and'into the socket to.

lit the same, and a key filling the passageto 4. In awell-tool, two parts adapted vto be subjected to torsion tending tdcause relative rotation between them, one part having .an opening adaptedto. receive" a I portion ofthe other part and having an'external projection by means of which the'torsional strain is put upon it, there being a passage in the wall of said opening and a lateral socket located inward and forward of said projection relative to the direction of said strain, a lug on said portion of the other part adapted to be passed through said passage and into the socket to fit the same, and a key filling the passage to hold the lug in the socket, the forward side of the lug fitting against a wall of the socket and extending radially of the central axes of V the parts.

5. In a well tool, two parts adapted to be subjected to torsion tendingto cause relative rotation between them, one part having an opening adapted to receive a portion of the other part and having an external projection by means of whi ch the torsional strain is put upon it, an enlargement on said section immediately forward of the projection relative to the direction of said strain, there being a passage in the wall of the opening radially inward of the enlargement and a lateral socket located inward and forward of the said external projection and communicating with the passage, a key filling the passage to hold the lug in the socket, and a part on the said enlargement covering the passage.

6. In a well tool, two parts adapted to be through said passage and into the socket to fit the same, aremovable key in the passage holding the lug in the socket, and a detach- V ward and forward of said projection relative able. means positively preventing displacement of the key from thepassage.

7.; In a well tool, twoparts adapted'to be subjected to torsion tending to cause relative rotation-between them, one part having-an opening adapted to receive aportio'n .of the. v other part and having, an external projection by'means of which thetorsional strain is put upon-it, there beinga passage in the wall of said opening and alatera-l socket located into the direction of said" strain,' a lug on said portionof the otherpart adapted tobe passed through said passage and intothe socket to fitthe same, the said other part having a shouldered enlargement for engaging an end of the first mentioned part, and a key in the passage holding the lug in the socket, there being a channel in the said shouldered enlargement to admitthe key into thepassage.

'Inwitness that I claim the foregoing I have'herennto subscribed my name" this 21st dayof August, 1929.

i v JESSE C. WRIGHT.

mean t 

